/*
 * icmp.h
 *
 * Copyright (c) 2012, Thomas Buck <xythobuz@me.com>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef _icmp_h
#define _icmp_h

#include <net/mac.h>
#include <net/ipv4.h>

#define ICMPOffset (MACPreambleSize + IPv4PacketHeaderLength)
#define ICMPPacketSize 4
#define ICMPTypeOffset 0
#define ICMPCodeOffset 1
#define ICMPChecksumOffset 2
#define ICMPDataOffset 4

#define ICMPMaxPacketSize (IPv4MaxPacketSize - ICMPDataOffset)

void icmpInit(void);

// 0 success, 1 not enough mem, 2 invalid
// p freed afterwards
uint8_t icmpProcessPacket(Packet *p);

void registerEchoReplyHandler(void (*func)(Packet *)); // func has to free p->d and p

void sendEchoRequest(uint8_t *ip);

#endif
